Glowing UFO over Sterling, VA

Early in the day on June 15, there was a tornado that touched down near Sterling, VA and it knocked all the power out for thousands of people.  There was no electricity for many hours, so my husband and I decided to cook our dinner on our outdoor barbeque and invite our neighbor over. 
We sat on the back porch and it was around 9 p.m., when the three of us went into the backyard. From the corner of my eye, I saw something coming fast and looked up, as did my neighbor.  My husband was looking in the opposite direction.  
A disk/saucer shape that glowed light orange-white was racing across the sky, slightly skipping/shifting from side to side.  Since there was no electricity, there was no light pollution and we got a good look.  It was about the size of a tablet of aspirin held at arms length.  
We watched it long enough that I began to crouch down afraid.  
It went across the sky in about 8 seconds and then tilted up into the night and disappeared -- I've never forgotten it and wonder if anyone else saw it. There was no sound -- it was completely quiet.